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Hi, this is my first post. Car popped the P0302 code for misfire on cylinder 2. I just replaced all the spark plugs and coil packs in September of last year as the car had misfire on multiple cylinders. I just did a few basic checks and unplugging and swapping coil packs changed the tone of the engine on every cylinder. I checked my spark plugs and they look good. The car has about 133k miles on it. To my knowledge a valve adjustment has not been performed. (I bought the car used at 70k). Could a valve adjustment fix the issue? If so does anyone know the clearance specs for the valves? Thanks ahead of time.

 
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What brand plugs and coils did you put in?

 
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I used Honda OEM. Coils and Honda gave me ngk spark plugs

 
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They should be fine then,
valve adjustment wouldn't hurt. The specs used to be under the hood on the emissions sticker. Not sure on the newer cars

 
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Ok cool thanks. If my coils and spark plugs are good and my injectors seem to be fine. It sounds like from what you’re saying is that a valve adjustment won’t get rid of the misfire? What else could cause this?

 
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It might, it might not. Could be the injector, burned valve, lack of compression, etc.
you've swapped coils and plugs cylinder to cylinder and it stays on 2?

 
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It changed from cylinder to cylinder

 
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Update: I just did a cylinder compression test. Readings are as follows.
Cylinder 1: 71psi
Cylinder 2: 75psi
Cylinder 3: 65psi
Cylinder 4: 70psi
Im not sure if these are in spec or not, I couldn’t seem to find the spec. If someone could tell me what the spec is and also what the possible issue is if they are out of spec. Thanks

 
Rep Power: 125

That compression is horrible. It should be more than double that. Are you sure you had the gauge threaded in the whole way?

I don’t know the exact figure but it should be 160-ish from factory.

 
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I’m pretty sure it was threaded in all the way. I’m not sure if I did the test correctly however. I thought you could do it just cranking the car. But a buddy told me you’re supposed to floor the gas pedal when performing the test.

 
Rep Power: 222

The throttle is supposed to be open, and all the plugs out
try again. Might want a battery charger hooked up to make sure the battery doesn't get weak from all the cranking

 
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Oh ok cool. So all the coils and spark plugs need to be out and full throttle, got it. Thanks